F40.9 — Phobic anxiety disorder, unspecified
Is F40.9 billable?
Yes, but F40.9 is an unspecified code. F40.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, F40.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting F40.9 — the more specific alternatives are listed below.
F40.9 at a glance
| Code | F40.9 |
|---|---|
| Description | Phobic anxiety disorder, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does F40.9 group to?
F40.9 sits in MDC 19 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 882Neuroses Except Depressivemedical
How is F40.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to F40.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Fear complex or reaction
- Phobia, phobic
- Neurosis, neurotic › phobic
- Phobia, phobic › reaction
- Phobia, phobic › state
- Reaction › fear
- Reaction › phobic
- State › phobic (of)
- Disorder › anxiety › phobic (of)
- Disorder › psychogenic NOS › phobic (of)
Inclusion terms
Alternative wording in documentation that is classified to F40.9.
- Phobia NOS
- Phobic state NOS
Excludes2 — not included here — inherited from Chapter 5
The conditions below are not part of F40.9, but a patient may have both at the same time. When documentation supports it, F40.9 and the excluded code may both be reported.
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
How long has F40.9 existed?
F40.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.